Ключевые слова: 101, advanced, basic, black, chalk, chalkboard, class, classes, classroom, classrooms, college, course, courses, discourse, educate, education, educational, elementary, grade, high, instruct, instruction, introduction, introductory, lecture, lectures, middle, practice, preparation, presentation, pupil, remedial, school, schooling, secondary, student, teach, teacher, teaching, technical, train, training, tutor, university, white,